MORPHOLOGY OF KNEE JOINT - CLASS- AVES - GENUS - GALLUS, - SPECIES - DOMESTICUS (CHICKEN) TO MAMMALS (HUMAN BEING)

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2 Int. J. LifeSc. Bt & Pharm. Res Sunil N Tidke and Sucheta S Tidke, 2013 Research Paper ISSN Vol. 2, No. 4, October IJLBPR. All Rights Reserved MORPHOLOGY OF KNEE JOINT - CLASS- AVES - GENUS - GALLUS, - SPECIES - DOMESTICUS (CHICKEN) TO MAMMALS (HUMAN BEING) Sunil N Tidke 1 * and Sucheta S Tidke 2 *Corresponding Author: Sunil N Tidke suniltidke3@gmail.com In the present investigation, a detailed comparison is made between the human knee and the knee of chicken (Gallus domesticus), with the object of determining similarities or variation of structure and their possible functional significance, if any special attention has been paid to bone taking part in joint, the surrounding muscles and tendons, which play an important part in stabilizing these joints, the form and attachments of the intraarticular menisci, which have been credited with the function of ensuring efficient lubrication throughout joints movement, and to the ligaments, the function of which is disputed. Keywords: Bony articular part, Intra capsular and extra capsular structure and Muscular changes INTRODUCTION The manner in which the main articulations of the vertebrate have become variously modified in relation to diverse function has been investigated by many workers, notably, Parsons (1900) and Haines (1942). The morphology of the knee joint of human has been studied in great detail, but the morphology of other animals is not completely studied and comparison of structural variation with functions is not attempted is any great detail. Haines R W observed that the distal end of femur of chicken shows a wide groove for the patella. A narrow groove on the lateral condyle of femur articulate with the head of the fibula and intervening femoro fibular disc. The tibia has a enormous ridge and crest for the insertion of the patellar tendon and origin of the extensor muscle. The cavity of the joint communicates above and below the menisci with the central part of joint around the cruciate ligament. The lateral menisci are not attached to either femur or tibia posteriorly, but forms a deep, mobile structure attached to the fibula by a small ligament. The femoro fibular disc is represented by a narrow triangular wedge of tissue attached by its base to the lateral menisci and by its apex to the fibular collateral ligament. 1 Department of Anatomy, Hi-tech Medical college, Rourkela, Odisha, India. 2 Department of Anasthesia, MGIMS, Sevagram, Maharashtra. 137

3 Bradley O C stated that the distal end of femur possesses a deep, pulley shaped surface for the patella and two convex condyles for articulation with the tibia and fibula of the leg. The fibula is only partly developed and consists of a slender spicule of bone expanded into a flattened head, which articulates with the lateral condyle of the femur. Feduccia A described that the distal end of femur possess a larger groove which accommodates the patellar sesamoid bone. Distally the femur has two condyles which articulate with the tibia and fibula. The knee is composed of two bones, medial larger one tibia and lateral short rudimentary bone, the fibula. OBSERVATIONS Articular Surfaces (Figures 1A and 1B) Distal end of femur: The femur in chicken is stout, cylindrical and slightly bent bone. The lower end is expanded and consists of two convex condyles, the medial and lateral for articulation with the tibia and fibula. The two condyles of femur are separated by a intercondylar notch. The lateral condyle is broader than the medial condyle. The distal end of femur on its anterior aspect carries a deep pulley shaped groove which Figures 1A and 1B: Bony Characteristics Photography Showing Distal End Of Femur, Upper End Of Tibia, Upper End Of Fibula King A S in the study of chicken noted that a patella is present in front of knee joint. The fibula is typically reduced to a slender pointed rod not fused to the tibia. MATERIALS AND METHODS The study material consist of ten knee joint of five chicken collected from the animal house department of pharmacology and ten knee joint of human being from dissection hall, department of Anatomy, Hi-tech Medical College, Rourkela, Odisha, India. All the animals were sacrificed after giving Euthanasia dose of phenobarbitone and preserved in 10% buffer formalin. Figures 2A and 2B: Photograph showing muscles of hind limb of the chicken a) Quadriceps femoris, b) Sartorius, c) Semimembranosus d) Semitendinosus, e) Gastrocnemius The morphological study of knee joint was carried out under the following heading. 1) Articular surfaces 2) Muscles 3) Collateral ligaments 4) Cruciate ligament 5) Mensci 138

4 Figures 3A and 3B: Photograph Showing Medial and Lateral Collateral Ligament of Chicken Figure 4A: Photograph showing (1) medial and (2) lateral meniscus and (3) femorofibular disc Figure 4B: Photograph showing (1) anterior and (2) posterior cruciate ligament accommodates the patella or knee cap. On the lateral condyle of femur, there is narrow groove running anteroposteriorly for the head of fibula. Upper end of tibia: Tibia is a long bone chiefly composed of tibia fused with the proximal row of tarsus and hence known as tibiotarsus. The upper end of tibia is broader transversely than antro posteriorly and consists of flat lateral and medial condyles which articulate with the condyles of the femur. The medial condyle is prominent than the lateral condyle, the articular surface of the medial condyle of the tibia is oval in outline. The medial condyle articulates with medial condyles of femur. Lateral condyle of tibia present a small articular surface which is flattened in general outlines and is gently concave. On the proximal end of anterior surface, there is a larger ridge and crest for the insertion of patellar tendon, anteriorly. Upper end of fibula: The fibula is reduced to a slender, spicule of bone. The upper end of fibula is expanded into a flattened plate like head. The part of the head lie above and on the lateral side of the tibiatarsus in an antero posterior direction. It articulates with narrow groove on lateral femoral condyle. The fibula is closely applied to the outer surface of the tibiotarsus. Osseous patella: Is short, tubular, flattened from before backward and is roughly triangular in shape with a broad base directed upward and a pointed apex directed downward. The anterior surface is rough and non-articular. Its posterior surface present a large smooth articular portion above and a narrow rough non-articular depressed portion below. 139

5 Table 1: Showing Origin and Insertion of Various Muscles Acting of Knee Joint of Species (Chicken) and Human Being Table 2: Showing Attachment of Collateral and Cruciate Ligament Muscles (Table 1, Figures 2A and 2B) 1. Quadriceps fermoris: It is the main extensor of the knee joint. As the name quadriceps fermoris suggested it has four heads of origin in human beings, Gray (1989) but in chicken only 3 heads of origin are observed in the 140

6 Table 3: Showing Attachment of Menisci present study. Vendon Berge (1975) also observed only three parts in chicken, the muscles in known as femoro tibialis. 2. Sartorius: In humans being the muscles gets inserted into the upper part of medial surface of tibia and acts as a flexor of hips and knee joint Gray (1989). In the present study in chicken, it is observed that the muscle arises from the cranio dorsal rim of the preactabular iliac crest and is inserted on the medial surface of the patella. The muscles extend the knee joint and also contribute in the flexion of the hip joint. Vanden Berge (1975) noted that iliotibialis cranialis (Sartorius) muscle in chicken acts just like quadriceps femoris muscle of human thigh. His observation regarding the origin and insertion of Sartorius in chicken are similar to the observation made in the present study. 3. The semimembranosus, semitendinosus and biceps femoris: The muscles belongs to the hamstring group, they are the muscles of the flexer compartment of the thigh. In the present study in both human and chicken the semitendinosus muscle originates from lower medial part of ischial tuberosity. The tendon of the muscle lies on the semimembranosus and get inserted into upper part of medial surface of the tibia. The semimembranosus muscle arises from the upper and lateral part of the ischial tuberosity. The muscle run downwards and medially and get inserted into back of medial condyle of tibia in chicken. The muscles are flexors and medial rotator of leg and extensor of hip joint. The bicep femoris muscle:- Instead of 2 heads of origin as in humans, in chicken it originates by a single head from the post acetabular iliac crest and get inserted into the posterior aspect of proximal end of the shaft of fibula. The muscle extends the hip, flex the knee similar findings were observed by Venden Berge. 4. Popliteus: In the present study, the popliteus muscle is not seen in chicken. This is similar to the observation made by Dye Scoti in chicken. 5. Gastrocnemius: It is a largest muscle forming the calf of the leg. It has two heads of origin in chicken and human being. The medial head arises from the posteromedial surface of femur just proximal to the medial condyle, while the lateral head arise from the posterolateral aspect of the lateral condyle of femur. The two heads run towards each other and join together. The lower part of this fused muscle, a very strong tendon known as tendocalcaneous runs on the back of the ankle 141

7 and gets inserted into middle of the posterior surface of calcaneous in both chicken and human being. Similar finding were observed by Vander Berge, in chicken and by Gray in human being. In chicken and human being muscle causes flexion of knee and plantar flexion of foot. 6. Extensor digitorum longus: The origin of the ext. digi. Longus is different in chicken and human being. In the chicken muscle takes origin from the small fossa on the lateral femoral condyle. The muscle run downward on the lateral side of leg and inserted into the middle and distal phalanges of the outer four toes. Contraction of the muscles in chicken produces extension of the knee joint and also extension of the foot and toes. Similar finding were observed by Vandon Berge and Dye Scoti in chicken. But in the humans beings, it is observed that the origin of the extensor digitorum longus slips down the fermur. It originates from the lateral condyle of the tibia and upper three fourth part of the anterior surface of the shaft of the fibula and also from the interosseus membrane and gets inserted into the middle and distal phalanges of the outer four toes. Kaplan (1958) and Dye Scoti (1987) also observed similar finding in man. Menisci (Table 3, Figure 4A) In chicken, the menisci are massive structures, the medial is C shaped, and the lateral is discoidal. Anteriorly, they are connected together by transverse ligament. The lateral meniscus is attached anteriorly to the tibia by a ligament. Posterioly, the medial meniscus is attached to the femur and also to the tibia. Posterioly, the lateral meniscus is not attached to either femur or tibia, but, forms a deep, mobile structure attached to the fibula by a small ligament. In chicken there is a femorofibular articulation. The femorofibular disc is the lateral expansion of the lateral meniscus. Similar finding were observed by Haines (1942). Parson (1900) observed that posterior horn of both the menisci in chicken was attached to the femur. But in the present study in the chicken, it was observed that only the posterior horn of the median meniscus is attached to the femur and the posterior horn of the lateral meniscus is free. Dye Scoti (1987) also found no ligament of Wrisberg analogus (i.e., posterior attachment of lateral menisci to the medial femoral condyle) in chicken. In human beings, the medial semilunar cartilage is somewhat oval in shape, while the lateral semilunar cartilage is circular in shape. The anterior and posterior ends of lateral meniscus come much more nearer to each other. They lie in between anterior and posterior end of medial meniscus. Both the menisci are attached to the anterior and posterior intercondylar area of the tibia by means of their anterior and posterior horns respectively. From the posterior ends of the lateral meniscus, the fibrous bands goes to medial condyle of femur. The posterior tibial attachments of the lateral meniscus appear to be unique to man. Parson (1900), Last (1984), Dye Scoti (1987), Grey (1987) and Minor (1990) had also noted the same. It seems to be progressive characteristics related to human bipedal locomotion. Cruciate ligament (Table 2, Figure 4B) In both chicken and human beings, two cruciate ligaments are observed crossing each other like the letter X in the interval between the two condyles of the femur and tibia. 142

8 Collteral Ligament (Table 2, Figures 3A and 3B) The observation of a asymmetrical medial and lateral collteral ligament made in the present study are similar to the finding of Dye Scoti in chicken and Gray in human beings. DISCUSSION Weichert C K (1953) stated that the hind limb of chicken are modified for bipedal locomotion. They may be adapted in addition, for swimming, purching, wading, running, scratching, fighting and other sundry purpose. Although there is much variation a striking uniformity exists in the basic structure of the hind limbs. The distal end of femur in chicken is pulley shaped and has two convex condyles for articulation with the bones of leg. The lateral condyle is grooved for the articulation of head of fibula indicating that the femorofibular articulation is present in chicken. The anterior aspect of the distal end present a deep pulley shaped surfaces for the patella. The tibia in chicken is much longer than the femur. As the lower end of the tibia is fused with the proximal rows of tarsal bone, it is known as tibiotarsus. In chicken the fibula is closely applied to the outer surface of the tibiotarsus throughout its length except its proximal end which is flat, expanded, triangular and articulates with a narrow groove on the lateral femoral condyle indicating a presence of femorofibular articulation. The femorofibular disc an extension of lateral meniscus is present in chicken and acts as a shock absorber for the femorofibular joint. In the present study, comparison of the muscles acting on the knee joint of chicken with corresponding one in the lower limb of man is done and it is observed that the quadriceps femoris muscle in human beings has four heads of origin where as in chicken it has three heads of origin. Similarly bicep femoris muscles has two heads of origin in human being where as the muscle take origin by a single head in chicken. The sartorius muscle in chicken is inserted on the patella while in man it is inserted on the tibia. This suggests that the sartorius muscle in chicken is acting just like a part of quadriceps femoris so as to extend the knee and flex the hip. The popliteus muscle is absent in chicken while in man it is the single most important stabilizer of the posterolateral region of the knee and resist external rotation of tibia on the femur during locking. The popliteus is usually regarded as the muscle that unlocks the joint at the beginning of flexion of the fully extended knee. In chicken the extensor digitorum longus muscle originates from the lateral condyle of femur and acts as a extensor of knee, foot and toes. This protraction of the foot in motion with simultaneous extension of the knee and tarsus creates advantage of distinct functional value. As the origin in man shifts down from the femur to tibia and fibula the toes are free to exert flexion and extension independent of the knee. In the human beings, the locomotion is with the soles of their feet on the ground (plantigrade) and the knee is habitually loaded in extension. Primitively, both the menisci, medial and lateral were attached anteriorly to the tibia and posteriorly to the intercondylar area of the femur. This type of attachment is retained in chicken. In most mammals, the medial meniscus has lost its posterior femoral attachment and it is attached to the tibia. In the human knee, the lateral meniscus, like the medial has gained a tibial attachment posteriorly. This posterior tibial attachment of the lateral meniscus appears to be unique to man. This specialization may be an adaptation to the erect posture. As during 143

9 continued extension of the knee, as attended during human erect posture, the posterior part of the meniscus is greatly strained creating a need to fix both the horns to the tibia. Its seems to be progressive characteristics related to human bipedal locomotion. CONCLUSION In chicken and mammals the arrangement for flexion and extension, and the function of the collateral and cruciate ligaments, are very similar. In human being several factors, not found in other species, are added for stability and relative freedom of action of the knee joint and liberation of the toes for independent activity. The toes are free to exert flexion and extension in stance and other activities independent of the knee joint. REFERENCES 1. Bernett C H (1954), A comparison of the human knee and avian ankle, J. Anatomy, Vol. 88, pp Bradley O C (1950), The structure of the fowl, 3 rd Edition, oliver and Boyd, Edinburgh, London, pp Dye S F (1987), An evolutionary perspective of knee, J. Bone. J. Surg., Vol. 69A, pp Feduccia A (1975), Sisson and Gross mans: The Anatomy of the domestic animals, 5 th Edition, Vol. 2, by R Getty, W B Saunders company, philadelphiac, pp Gray (1989), Grays Anatomy, 37 th Edition, Charchill livingstone, London, pp , , Haines R W (1942), The tetrapod knee joint, J. Anatomy, Vol. 76, pp Kaplan E B (1958), Comparative anatomy of the extensor digitorum longus in relation to the knee joint, Anat. Rec., Vol. 131/2, pp King A S (1975), Outline of avian anatomy, Bailliere, Tindall, London, pp Last R J (1950), The popliteus muscle and lateral menisci, J. Bone joint Surg., Vol. 32B, pp Last R J (1984), Anatomy-Regional and applied, 7 th Edition, Charchill livingstone, London, pp Mcminn H M R (1994), Anatomy-Regional and applied ELBS edition, Charchill livingstone, London, p Minor J M (1990), Comparative morphology of the lateral menisci of the knee in primates, J. Anatomy, Vol. 170, pp Parson F G (1900), The joints of mammals compared with those of man. Part II, J. Anatomy, Vol. 34, pp Vendon Berge J C (1975), Sisson and Grossmans: The anatomy of the domestic animals, 5 th Edition, Vol. 2, Philadelphia, pp Weichert C K (1953), Elements of chorate anatomy, W B Saunders Company, Philadelphia, London, pp

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